How I can prevent Emacs from saving my buffer when it contains syntax errors ?

It would by especially useful for editing source code.

I'm writing some source code into the buffer, hit C-x C-s and Emacs should position the cursor on the line containing the error. I'm correcting the error, hit the save command again, and Emacs should save the file.

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    You do not say what sources you would like to check. There are different tools for different types. And ways these can be integrated into emacs. Mar 5, 2010 at 17:05

2 Answers 2


My approach to this problem would be to rebind C-x C-s to astropanic-save-buffer which would be an elisp function that would run the contents of the current buffer through whatever your compiler/build process is. If it passed, it would run save-buffer and if there was an error it would create a new buffer/window split with the error message so you could fix it.

Consider also using the write-file-functions(more info) hook to attach workflow to save-buffer, but I'm wary of this on the grounds that while I might think that I'd want this in some modes, I wouldn't in all modes.


Emacs flymake mode may be close to what you want. It does dynamic compiling/syntax checking of source code for the current buffer.

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